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CN1825140A - Low-reflectivity brightness-enhancing multilayer optical film and organic light-emitting diode display - Google Patents

Low-reflectivity brightness-enhancing multilayer optical film and organic light-emitting diode display Download PDF

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Publication number
CN1825140A
CN1825140A CNA2005100853363A CN200510085336A CN1825140A CN 1825140 A CN1825140 A CN 1825140A CN A2005100853363 A CNA2005100853363 A CN A2005100853363A CN 200510085336 A CN200510085336 A CN 200510085336A CN 1825140 A CN1825140 A CN 1825140A
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light
layer
resin
optical film
particle
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CN100383562C (en
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林祥奎
金泰炅
徐辉旼
宋利花
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Cheil Industries Inc
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/8791Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47GHOUSEHOLD OR TABLE EQUIPMENT
    • A47G29/00Supports, holders, or containers for household use, not provided for in groups A47G1/00-A47G27/00 or A47G33/00 
    • A47G29/087Devices for fastening household utensils, or the like, to tables, walls, or the like
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02Plumbing installations for fresh water
    • E03C1/06Devices for suspending or supporting the supply pipe or supply hose of a shower-bath
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/86Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/86Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K50/865Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/8791Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K59/8792Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301Details of OLEDs
    • H10K2102/351Thickness

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  • Life Sciences & Earth Sciences (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)
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Abstract

本发明公开了一种低反射率亮度增强多层光学膜,用于增强有机发光二极管(OLED)显示器的亮度,使该显示器具有抗反射功能。多层光学膜包含透明基底、由湿涂法形成在透明基底上的光漫射层和由湿涂法形成在光漫射层上的吸光层,其中基底的厚度为10-300μm,光漫射层包含树脂和球状颗粒,吸光层包含50-500重量份的芯-壳结构吸光颗粒,该吸光颗粒由作为芯部材料的吸光剂和作为壳体材料的透明树脂构成。还公开了一种使用该多层光学膜的有机发光二极管(OLED)显示器。

The invention discloses a multilayer optical film with low reflectivity and brightness enhancement, which is used for enhancing the brightness of an organic light-emitting diode (OLED) display, so that the display has an anti-reflection function. The multilayer optical film comprises a transparent substrate, a light-diffusing layer formed on the transparent substrate by a wet coating method, and a light-absorbing layer formed on the light-diffusing layer by a wet coating method, wherein the thickness of the substrate is 10-300 μm, and the light-diffusing layer is The layer contains resin and spherical particles, the light-absorbing layer contains 50-500 parts by weight of core-shell structure light-absorbing particles, and the light-absorbing particles are composed of a light-absorbing agent as a core material and a transparent resin as a shell material. An organic light emitting diode (OLED) display using the multilayer optical film is also disclosed.

Description

Antiradar reflectivity brightness strengthens multi-layer optical film and organic light emitting diode display
This non-provisional application is korean patent application No.2005-14862 according to the right of priority that 35 U.S.C. § 119 (a) require, and on February 23 2005 applying date, quotes as a reference at this.
Technical field
The present invention relates to a kind of antiradar reflectivity brightness that can be applied to display and strengthen multi-layer optical film, relate more specifically to a kind of brightness and strengthen multi-layer optical film, comprise transparent substrates, be formed on the optical diffusion layer on the transparent substrates and be formed on light-absorption layer on the optical diffusion layer by the wet method that is coated with by the wet method that is coated with, wherein the thickness of substrate is 10-300 μ m, optical diffusion layer comprises resin and spherical particle, light-absorption layer comprises the core-shell structure extinction particle of 50-500 weight portion, and this extinction particle is by constituting as the optical absorbing agent of core material with as the transparent resin of case material.
The invention still further relates to the organic light emitting diode display of using this blooming, relate more specifically to organic light emitting diode display, wherein blooming is positioned at the pre-portion of the transparent substrates of light-emitting component, light-emitting component comprises from the bottom laminated negative electrode, luminescent layer, anode and the transparent substrates of preface according to this, perhaps blooming is arranged in the upper surface or the lower surface of light-emitting component, and light-emitting component comprises laminated negative electrode, luminescent layer and the anode of preface according to this.
Background technology
The structure of the light-emitting component of organic light emitting diode display is: inject luminescent material between high work function electrode and low work function electrode.The anode that the high work function electrode injects as the hole, the negative electrode that the low work function electrode injects as electronics.The light-emitting component that is shown in Fig. 1 particularly comprises from the top laminated negative electrode, electron transfer layer, luminescent layer, hole transfer layer, hole injection layer, anode and the substrate of glass of preface according to this.
The principle of luminosity of Organic Light Emitting Diode (below be abbreviated as " OLED ") is as follows.Hole from the injection of high work function anode in the luminescent layer is connected to from the electronics of low work function negative electrode injection, thereby at the certain wave long persistent luminescence.The light that luminescent layer gives out is propagated to transparent substrates, as shown in Figure 1.
For electronics is injected easily and luminescence efficiency better, negative electrode is made by low workfunction metal usually, is selected from magnesium (Mg), magnesium-silver alloy (MgAg), aluminium (Al), lithium-aluminium alloy (LiAl) and calcium (Ca).This metal electrode is surface reflection, thereby a large amount of exterior light that incide on the light-emitting component are reflected from negative electrode.Exterior light causes OLED display contrast variation from the internal reflection meeting of negative electrode.
In order to improve OLED display contrast's variation, described in the open No.1997-127885 (see figure 3) of Japanese patent unexamined and used the circular polarizing plate that constitutes by linear polarizing plate and 1/4th (1/4) wavelength plates.Though compare with not using polarizing plate, use circular polarizing plate to improve the contrast ratio of OLED display, transmittance is reduced to about 45% by polarizing plate, the brightness of display is greatly reduced.
As shown in Figure 2, the main cause that brightness reduces in traditional OLED display is the total reflection effect, by the different refractivity generation of each layer that constitutes light-emitting component; And polarization phenomena, by using circular polarizing plate to cause.If it is 100 that the luminescent layer of light-emitting component gives out the relative brightness of light, the light final brightness of passing hole transfer layer, hole injection layer, anode and transparent substrates in proper order is reduced to about 20 so.When the light that sends from light-emitting component passed circularly polarizing plate, brightness was reduced to about 10 again.The light output efficiency of last OLED display is low, is about 10%.
And Korean Patent is examined open No.2003-0013923 and has been proposed a kind of light-emitting component of highlighting and reducing of being used to, and brightness reduces by using circularly polarizing plate to cause.According to this patent disclosure, light-emitting component comprises transparent substrates, be formed on the anode on the transparent substrates, be formed on the luminescent layer on the anode, be formed on electron injecting layer or electron transfer layer on the luminescent layer, with the negative electrode that is formed on electron injecting layer or the electron transfer layer, wherein one deck comprises light absorbent at least, or light absorbent is injected between the layer.The light absorbent that comprises in this way or inject has reduced extraneous light and has entered the quantity of light-emitting component, but has absorbed the light that a part is produced by luminescent layer, and the light output efficiency of light-emitting component has descended.The brightness characteristics of light-emitting component is poor as a result.And owing to light absorbent mixed with the material of formation electron transfer layer and electron injecting layer or form other light-absorption layer, be a kind of layer structure of light-emitting component and method of layer composition material of changing, so compare with the manufacturing of common light-emitting component, by yield poorly, the formation of the layer of difficulty that cost is higher makes light-emitting component.Just not saying light-absorption layer has anti-reflection function in order to make light-emitting component, must on transparent substrates, form independent anti-reflective film (corresponding to substrate of glass shown in Figure 1) again.
Summary of the invention
The antiradar reflectivity brightness that an object of the present invention is to provide a kind of OLED of being used for display strengthens multi-layer optical film and uses the OLED display of this blooming.
Owing to comprise the light output efficiency height that the light-emitting component of the OLED display of blooming of the present invention sends,, and can obtain anti-reflection function so its advantage is the brightness characteristics height.
Description of drawings
With reference to accompanying drawing, from following detailed description, can more be expressly understood above and other objects of the present invention, feature and other advantage.
Fig. 1 is the cross-sectional view of organic LED structure;
Fig. 2 is the demonstration diagram that common organic light emitting diode display brightness reduces reason;
Fig. 3 is the demonstration diagram of the circularly polarizing plate 26S Proteasome Structure and Function that uses in the common organic light emitting diode display;
Fig. 4 is the coating structure figure of blooming according to an embodiment of the invention;
Fig. 5 is the demonstration diagram of the principle and the function of the blooming according to the present invention;
Fig. 6 is the figure that shows blooming surface reflectivity of the present invention;
Fig. 7 is the photo that shows the optical diffusion layer surface of blooming of the present invention;
Fig. 8 is the cross sectional image of the extinction particle of the blooming according to the present invention;
Fig. 9 is the photo that shows blooming light-absorption layer of the present invention surface.
Embodiment
To illustrate in greater detail the present invention below.
As shown in Figure 4, antiradar reflectivity brightness of the present invention strengthens multi-layer optical film and is used to strengthen the luminosity of display, and makes display have anti-reflection function.Blooming of the present invention particularly comprises transparent substrates, be formed on optical diffusion layer on the transparent substrates by the wet method that is coated with, with the light-absorption layer that is formed on by the method that is coated with that wets on the optical diffusion layer, wherein the thickness of substrate is 10-300 μ m, optical diffusion layer comprises resin and spherical particle, light-absorption layer comprises the core-shell structure extinction particle of 50-500 weight portion, and this extinction particle is by constituting as the optical absorbing agent of core material with as the transparent resin of case material.
From the figure of the reflectivity of Fig. 6 as can be seen: because blooming of the present invention has from the teeth outwards by the granuloplastic lenticule of extinction, because the diffuse reflection effect, this blooming demonstrates excellent low reflectivity.
The present invention also provides a kind of OLED display, one-way transmission type multi-layer optical film wherein of the present invention is arranged on the top of light-emitting component transparent substrates, this light-emitting component comprises from the bottom laminated negative electrode, luminescent layer, anode and the transparent substrates of preface according to this, perhaps blooming is arranged on the upper surface or the lower surface of light-emitting component, this light-emitting component comprises laminated negative electrode, luminescent layer and the anode of preface according to this, thereby makes the light-absorption layer of blooming be positioned at the opposite of light-emitting component.
Blooming of the present invention prepares by the following method: execute on transparent substrates and cover the optical diffusion layer (Fig. 5) that comprises resin and spherical particle, on optical diffusion layer, execute the extinction particle that covers core-shell structure and as the transparent resin of bonding agent, consisting of of extinction particle: optical absorbing agent is as core material, and transparent resin is as shell material.The structure of blooming of the present invention is shown in Fig. 4.If the refractive index of the resin of formation extinction particle shell equates with the transparent resin as bonding agent or is approaching that as shown in Figure 5, the optical interface between shell and the bonding agent has disappeared so, thereby produces the effect of semicircle lens.In addition, even the refractive index of the resin of formation extinction particle shell is different from the transparent resin as bonding agent, because the effect that the surface configuration of blooming also can produce semicircle lens.
As above-mentioned, blooming of the present invention prepares by the following method: form the optical diffusion layer that comprises resin and spherical particle on transparent substrates, on optical diffusion layer, form the light-absorption layer (Fig. 8) that comprises core-shell structure extinction particle with transparent resin, consisting of of extinction particle: optical absorbing agent is as core material, and transparent resin is as shell material.As shown in Figure 5, when the internal light that gives out when the luminescent layer from light-emitting component is passed optical diffusion layer (wherein light is by diffusion), have only a spot of light that incides on the optical absorbing agent to be absorbed, left display by other interior lights of optical diffusion layer scattering.Compare with the common OLED display that uses circular polarizing plate, the light output efficiency height of display of the present invention can obtain high brightness capabilities.
As shown in Figure 5, the internal light 6 that enters display is because the semicircle lensing of blooming surface and assembling in the core direction of extinction, and absorbed by core.Because the effect of core, exterior light is minimized from the internal reflection of the metal of formation negative electrode, therefore can improve the contrast of display.
Below the relevant ingredient that constitutes blooming of the present invention will be explained in more detail.
[transparent substrates]
The transparent substrates that is used to prepare blooming of the present invention without limits, as long as the highly transparent film that transparent substrates is the penetrability height, mist degree is low and mechanical property is excellent.The preferred example of transparent substrates is including, but not limited to polyethylene terephthalate (PET) film; PEN (PEN) film; polycarbonate (PC) film; polystyrene film, polychloroethylene film, polyethylene film; polypropylene screen; cyclenes copolymer (COC) film, tri acetyl cellulose (TAC) film, and their combination.The thickness of these transparent substrates is preferably 10-300 μ m.If used thickness is less than the transparent substrates of 10 μ m, the problem that may produce is: apply and dry run in by being applied to the fold that thermal shrinkage on the film and tension force cause.And use the shortcoming of thin transparent substrates to be: light-absorption layer shrinks in dry run, and therefore crimping may take place at the basal edge place when cutting into the OLED display of preliminary dimension.On the other hand, if used thickness surpasses the transparent substrates of 300 μ m, it just can not be wound in the roller shape easily so, makes substrate be difficult to processing.
Can on the sheet transparent substrates, form light-absorption layer, and not lose the inherent function of light-absorption layer.If substitute membranaceous transparent substrates, can improve defencive function so for light-emitting component with clear sheet.The example of suitable clear sheet including, but not limited to, the acrylic acid sheet material of high transparent, high transparent polycarbonate sheet and high transparent polyester sheet.
[sandwich construction]
As shown in Figure 4, multi-layer optical film of the present invention comprises the optical diffusion layer that contains resin and spherical particle, with be formed on the optical diffusion layer the extinction particle that contains core-shell structure and as the light-absorption layer of the transparent resin of bonding agent, consisting of of core-shell structure extinction particle wherein: optical absorbing agent is as the material of core, and transparent resin is as the material of housing.
Consider excellent optical property, the light diffusion particles that constitutes optical diffusion layer is preferably arranged for has single layer structure, but not lamination.Certainly, although multilayer is arranged, light diffusion particles also demonstrates optical property.
The light diffusion particles that constitutes optical diffusion layer is the spherical transparent particle, is selected from following composition: silicon dioxide, acryl resin, polystyrene resin, the styrene-propene acid copolymer resin, polyvinyl resin, epoxy resin, organic siliconresin, silicon rubber, and their potpourri.The light diffusion particles preferred average diameter is 1 μ m-10 μ m, more preferably 1 μ m-5 μ m.As the transparent resin that is used as bonding agent in the optical diffusion layer, can use UV to solidify or thermoset resin.Suitably the example of transparent resin for example comprises homopolymer and the multipolymer of acrylate as monomer, methacrylic resin including, but not limited to acryl resin, for example comprise homopolymer and the multipolymer of methacrylate, urethane resin, vibrin as monomer, the styrene-acrylonitrile copolymer resin, styrene resin, polyvinyl chloride resin, butyral resin, organic siliconresin, epoxy resin, melamine resin, and their potpourri.More preferably high high transparent acrylic resin and the methacrylic resin of penetrability.
The monomer that is used to prepare thermoset resin is an acrylic acid, methacrylic acid, acrylate, methacrylate, ethyl acrylate, butyl acrylate, methyl acrylate, methyl methacrylate, Jia Jibingxisuanyizhi, butyl methacrylate, acrylic acid hydroxy methyl, Hydroxyethyl Acrylate, acrylic acid hydroxyl butyl ester, methacrylic acid hydroxyl methyl esters, methacrylic acid hydroxyl ethyl ester, methacrylic acid hydroxyl butyl ester etc.Can easily prepare thermoset resin by in suitable organic solvent (for example MEK), using initiator appropriate that monomer is carried out free radical polymerization.Because thermosetting acrylic resin contains polar functional group on the resin side chain, for example hydroxyl or carboxyl, it can form hydrogen bond with substrate (for example polyester or cellulose acetate ester substrate).Hydrogen bond helps to improve the bounding force of coating and substrate.
Preferably be used for the hardening agent of thermoset resin can be easily and the reactive group of thermosetting acrylic resin (for example hydroxyl or carboxyl) react, for example it is at least a compound that is selected from following composition: isocyanates, melamino-formaldehyde, ureaformaldehyde, polyaziridine, titanate, zirconium composite and epoxy resin.
Consider preparation efficiency, manufacturing cost and mar resistance, the UV cured resin is more suitable for the bonding agent as optical diffusion layer.UV solidifies optical diffusion layer can be by adding UV cured resin, light diffusion particles and adjuvant with predetermined ratio in suitable solvent, dissolve or disperse this potpourri to obtain coating fluid, this coating fluid applied on the transparent substrates to form then.As adjuvant, can exemplify Photoepolymerizationinitiater initiater, UV absorbing agent, light stabilizer, antioxidant, levelling agent, defoamer, coupling agent, particle dispersants and other adjuvant.
As the UV cured resin; can not add any qualification ground and use composition; wherein suitably mix monomer, oligomer and the prepolymer that comprises at least one polymerizable unsaturated bond, for example acryloyl group, methacrylyl, acryloxy or isobutylene acyl-oxygen base according to intended purpose.Suitably the example of monomer is including, but not limited to methacrylate, methyl methacrylate, methoxyl polyethyl methacrylate (methoxy polyethylenemethacrylate), cyclohexyl methacrylate, the methacrylic acid phenoxy ethyl, methacrylate glycol ester, double pentaerythritol methacrylate and styrene.Suitably the example of oligomer or prepolymer is including, but not limited to esters of acrylic acid, polyester acrylate for example, urethane acrylate, epoxy acrylate, polyethyl acrylate, alkyd acrylate, melamine acrylate and organic silicon acrylic ester, unsaturated polyester (UP) class, and epoxy compounds.Cured film has excellent permanance under the condition of strictness if desired, and for example thermotolerance, wearing quality and solvent resistance preferably increase the consumption of monomer and the acrylate-based monomer of the three or more functionalities of use.
Be necessary to add Photoepolymerizationinitiater initiater to solidify this UV cured resin.Photoepolymerizationinitiater initiater is preferably selected from following composition: acetophenones, diethoxy acetophenone for example, benzyl dimethyl ketal and 1-hydroxy-cyclohexyl-phenyl ketone; Benzoin ethers, benzoin methyl ether for example, benzoin ethylether, benzoin isopropyl ether and benzoin isobutyl ether; Benzophenones, benzophenone for example, 4-phenyl benzophenone, 4-benzoyl-N, N-dimethyl-N-[2-(1-oxo-2-propenyl oxygen) ethyl] benzene first ammonium bromide and (4-benzoyl benzyl) trimethyl ammonium chloride; The thioxanthene ketone, for example 2,4-diethyl thioxanthone and 1-chloro-4-two clopenthixal ketones; 2,4,6-trimethylbenzoyl diphenyl benzene formyl oxide; And their potpourri, but be not limited to these.As promoter (sensitizer), can use amines, N for example, N-dimethyl-p-toluidine.With respect to the solids content of UV cured resin, the content of Photoepolymerizationinitiater initiater is preferably 0.1-10wt%.
As shown in Figure 7, consider excellent optical property, the light diffusion particles that constitutes optical diffusion layer is preferably arranged for single layer structure, and without laminated.
Be coated with method light diffusion particles and transparent resin are applied on the transparent substrates with wet, and do not need laminatedly, wetly be coated with rule such as intaglio plate is coated with, mouthful pattern coating, scraper coating (commacoating) or kapillary coating (capillary coating).
The optical absorbing agent that constitutes extinction particle core is not particularly limited, and needs only its absorbing light effectively.Suitably the example of optical absorbing agent comprises carbon black, black pigment, black dyes, iron oxide and their potpourri.These optical absorbing agents can use separately, or use with the resin combination that constitutes core.
Constitute extinction particle shell examples of material and comprise the highly transparent resin that penetrability is high, acryl resin for example, methacrylic resin, polystyrene resin, acrylic acid-styrene copolymer resin, pet resin, and their potpourri, but be not limited to these.With regard to improving solvent resistance, chemical reagent resistance, photostability and thermotolerance, more preferably use the housing constituent material of the crosslinked resin of highly transparent as the extinction particle.
It is spherical that the extinction particle is fit to, and preferred diameter is 1-50 μ m.When the diameter of extinction particle during, be difficult to wetly be coated with method the extinction particle is arranged to individual layer with above-mentioned less than 1 μ m.But when the diameter of extinction particle surpassed 50 μ m, the numbers of particles that is included in pixel of display was few, makes it stop incidence of external light effectively to display, has reduced the sharpness of figure.If the diameter of extinction particle surpasses 50 μ m,, therefore do not reach low reflex owing to can not form small out-of-flatness from the outstanding semicircle lens in blooming surface yet.Blooming generally is installed in the outermost part of OLED display, as the anti-reflective film of plasma display device (PDP) TV.Therefore blooming should have low reflectivity to prevent dazzling and to improve image definition.From the reflectance pattern of Fig. 6 as can be seen, the average surface reflectance of blooming of the present invention is low, is 5%.
In the preferred extinction particle core is arranged.If in the extinction particle two or more cores are arranged, the absorptance that enters into the exterior light of display so will raise, but the output efficiency of the light that sends from light-emitting component can descend, and causes the brightness of display low.The intragranular core of extinction position can be represented with the degree of eccentricity that following formula calculates:
Degree of eccentricity=(distance) ÷ (radius of extinction particle) from extinction particle center to the core center.
The degree of eccentricity of core preferably is lower than 0.5 in the scope of 0-1.0.
Because the semicircle lensing in process one-way transmission type blooming process of the present invention, the exterior light that enters into display is assembled at extinction particle center position.When the degree of eccentricity of core greater than 0.5 the time, most collected light do not stop by optical absorbing agent, but incides on the light-emitting component, causes reflecting as the metal electrode of negative electrode, causes display contrast's decline.
When the mean diameter of core and extinction particle than at 0.2-0.75 the time, the brightness characteristics excellence of blooming.On the other hand, when the diameter of core and extinction particle than greater than 0.75 the time, outside incident light can be stopped effectively, but the light that great majority give out from light-emitting component absorbed by core, reduced luminosity.As mentioned above, because polarization, use the penetrability of regular display of circular polarizing plate low, be about 45%.Similarly, when the diameter of core and extinction particle when surpassing 0.75, the penetrability of display is 50% or lower.
Preferably the extinction particle that the 50-500 weight portion is constituted light-absorption layer mixes with the transparent resin of 100 weight portions.If the combined amount of extinction particle is less than 50 weight portions, they are covered by transparent resin fully in the time of on being coated on transparent substrates, make that semicircle lens are difficult to form on the blooming surface.And on coating layer, can form the zone that does not comprise particle.When the combined amount of extinction particle surpassed 500 weight portions, they can not be surrounded fully by transparent resin, make particle deviate from (deintercalation), and particle are stacked, and do not have applied one-tenth individual layer simultaneously.
Be used as the transparent resin of bonding agent in the light-absorption layer, can use UV to solidify or thermoset resin, the example of suitable transparent resin is including, but not limited to acryl resin, for example comprise homopolymer and the multipolymer of acryl resin as monomer, methacrylic resin, for example comprise homopolymer and the multipolymer of methacrylate as monomer, urethane resin, vibrin, styrene-acrylonitrile copolymer resin, styrene resin, Corvic, butyral resin, organic siliconresin, epoxy resin, and melamine resin.The more preferably acryl resin of the highly transparent that penetrability is high and methacrylic resin.
The examples of monomers that is used to prepare thermoset resin is including, but not limited to acrylic acid, methacrylic acid, acrylate, methacrylate, ethyl acrylate, butyl acrylate, methyl acrylate, methyl methacrylate, Jia Jibingxisuanyizhi, butyl methacrylate, acrylic acid hydroxy methyl, Hydroxyethyl Acrylate, acrylic acid hydroxyl butyl ester, methacrylic acid hydroxyl methyl esters, methacrylic acid hydroxyl ethyl ester and methacrylic acid hydroxyl butyl ester.In appropriate organic solvent (for example MEK), use suitable initiating agent that monomer is carried out free radical polymerization, can easily prepare heat reactive resin.Because thermosetting acrylic resin contains polar functional group on the resin side chain, for example hydroxyl or carboxyl are so it can form hydrogen bond with substrate (for example polyester or cellulose acetate ester substrate).Hydrogen bond helps to improve the bounding force of coating and substrate.
Preferably being used for the hardening agent of thermoset resin can be easily and reactive group (for example hydroxyl or the carboxyl) reaction of thermosetting acrylic resin, and this hardening agent for example is at least a compound that is selected from following composition: isocyanates, melamino-formaldehyde, ureaformaldehyde, polyaziridine, titanate, zirconium composite and epoxy resin.
Consider preparation efficiency, manufacturing cost and mar resistance, the UV cured resin is more suitable for the bonding agent as light-absorption layer.UV solidifies light-absorption layer and can form by the following method: add UV cured resin, extinction particle and the adjuvant of predetermined ratio in appropriate solvent, with this potpourri dissolving or dispersion, to obtain coating fluid, this coating fluid is applied on the optical diffusion layer.As adjuvant, exemplify: Photoepolymerizationinitiater initiater, UV absorbing agent, light stabilizer, antioxidant, levelling agent, defoamer, coupling agent and particle dispersants with can not adding qualification.
As the UV cured resin, can use composition, wherein suitably mix monomer, oligomer and the prepolymer that comprises at least one polymerizable unsaturated bond, for example acryloyl group, methacrylyl, acryloxy or isobutylene acyl-oxygen base according to intended purpose.Suitably the example of monomer is including, but not limited to methacrylate, methyl methacrylate, methoxyl polyethyl methacrylate (methoxy polyethylene methacrylate), cyclohexyl methacrylate, the methacrylic acid phenoxy ethyl, methacrylate glycol ester, double pentaerythritol methacrylate and styrene.Suitably the example of oligomer or prepolymer is including, but not limited to esters of acrylic acid, polyester acrylate for example, urethane acrylate, epoxy acrylate, polyethyl acrylate, alkyd acrylate, melamine acrylate and organic silicon acrylic ester, unsaturated polyester (UP) class, and epoxy compounds.Cured film has excellent permanance under the condition of strictness if desired, and for example thermotolerance, wearing quality and solvent resistance preferably increase the consumption of monomer and the acrylate-based monomer of the three or more functionalities of use.
Be necessary to add Photoepolymerizationinitiater initiater to solidify this UV cured resin.Photoepolymerizationinitiater initiater is preferably selected from following composition: acetophenones, diethoxy acetophenone for example, benzyl dimethyl ketal and 1-hydroxy-cyclohexyl-phenyl ketone; Benzoin ethers, benzoin methyl ether for example, benzoin ethylether, benzoin isopropyl ether and benzoin isobutyl ether; Benzophenones, benzophenone for example, 4-phenyl benzophenone, 4-benzoyl-N, N-dimethyl-N-[2-(1-oxo-2-propenyl oxygen) ethyl] benzene first ammonium bromide and (4-benzoyl benzyl) trimethyl ammonium chloride; The thioxanthene ketone, for example 2,4-diethyl thioxanthone and 1-chloro-4-two clopenthixal ketones; 2,4,6-trimethylbenzoyl diphenyl benzene formyl oxide; And their potpourri.As promoter (sensitizer), can use amines, N for example, N-dimethyl-p-toluidine.With respect to the solids content of UV cured resin, the content of Photoepolymerizationinitiater initiater is preferably 0.1-10wt%.
When solidifying to form coating with UV, raw material is suitably mixed, or needs a kind of device to satisfy following performance:
Must avoid the intervention of oxygen (to need nitrogen (N when i) UV solidifies 2) cleaning device);
Ii) cure shrinkage must minimize and
Iii) must be good with the bonding of substrate.
[bonding coat]
In order effectively blooming of the present invention to be installed on the OLED display, can on the surface of transparent substrates, form bonding coat, this surface is on the opposite that forms the light-absorption layer surface.As execute and cover the light-absorption layer, form bonding coat by the wet method that is coated with, for example intaglio plate coating, mouthful pattern coating, or scraper coating.Bonding coat can directly form by coating.For higher throughput rate, can or buy double-sided adhesive film by independent method manufacturing, whole then laminated with blooming.
Can on transparent substrates, execute the coating fluid that covers mixing, dry then, form bonding coat, this coating fluid comprises acrylate copolymer, bonding agent (for example ethyl acetate, toluene or MEK) and hardening agent (for example hexamethylene diisocyanate (HMDI) or toluene diisocyanate (TDI)).
[OLED display]
The light-emitting component of OLED display comprises laminated negative electrode, luminescent layer, anode and the transparent substrates of preface according to this.Specifically be shown in Fig. 1, light-emitting component is made up of negative electrode, electron transfer layer, luminescent layer, hole transfer layer, hole injection layer, anode and substrate of glass.Blooming of the present invention is installed in the top of light-emitting component transparent substrates (ITO deposits substrate of glass), thereby makes the light-absorption layer of blooming be positioned at the opposite of light-emitting component.This structure makes the OLED display have high brightness capabilities.
Embodiment
With reference to following embodiment and Comparative Examples the present invention is described in more detail below.But these embodiment are not intended to limit the invention.
Assess the physical property of the blooming for preparing in following embodiment and the Comparative Examples according to following step separately.
(1) total transmittancy
According to ASTM D1003 standard method, use penetrability and mist degree measuring instrument (Nippon Denshoku Kogyo Co., Japan makes) to measure the penetrability of blooming.Each sample all is arranged to light is propagated in the following order: light source → blooming (bonding coat/transparent substrates/light diffusion particles coating layer/extinction particle coating layer) → whole spheroid.Total transmittancy with following formula calculation sample:
Total transmittancy=(transmitted light/incident light) * 100 (%)
(2) unidirectional penetrability
According to ASTM D 1003 standard methods, use penetrability and mist degree measuring instrument (Nippon Denshoku Kogyo Co., Japan makes) to measure the penetrability of blooming.Each sample all was arranged in light was propagated in the following order this moment: (i) light source → blooming (transparent substrates/light diffusion particles coating layer/extinction particle coating layer) → whole spheroid; (ii) light source → blooming (extinction particle coating layer/light diffusion particles coating layer/transparent substrates) → whole spheroid.The unidirectional penetrability of sample is defined as penetrability poor of two kinds of arrangements.
(3) reflectivity
Use UV visible spectrophotometer (Perkin Elmer, U.S.A.) 5 ° of reflectivity of measurement extinction particle coating layer in the wavelength coverage at 380-750nm under the D65 light source.
(4) brightness
Use externally light (500lx) brightness of measurement OLED display down of BM-7 YC meter (Topcon).The structure of this OLED display is OLED light-emitting component/blooming (bonding coat/transparent substrates/extinction particle coating layer).
(5) contrast (CR)
Use the device that uses in (4), externally measure the brightness of OLED display under the light (500lx), calculate the contrast of OLED display then with following formula.
Contrast (CR)=(brightness of white light)/(brightness of black light)
Embodiment 1
Use thick polyethylene terephthalate (PET) film of 100 μ m as transparent substrates.The coating fluid for preparing optical diffusion layer with following steps.At first, with 200 weight portion mean diameters is that the light diffusion particles of 5 μ m fully stirs, and be scattered in the mixed solvent that comprises 300 weight portion isopropyl alcohols (IPA), 300 weight portion MEKs (MEK), 200 parts by weight of toluene and 100 weight portion cyclopentanone, obtain the dispersion of light diffusion particles.(Aekyung Chemical Korea) mixes with this dispersion, stirs 3 hours then to obtain the resin solution of particle dispersion with 100 weight portions (solids content) thermosetting acrylic resin.At the moulding optical diffusion layer preceding 1 hour, (Aekyung Chemical was Korea) with the coating fluid of preparation optical diffusion layer to add the isocyanate curing agent of 25 weight portions in this resin solution.This coating fluid is coated on the transparent substrates the dry thick optical diffusion layer of 7 μ m that forms with scraper coating (bar coating) method.Individually, with 200 weight portion mean diameters is that the extinction particle of 5 μ m fully stirs, and be scattered in the mixed solvent that comprises 300 weight portion isopropyl alcohols (IPA), 300 weight portion MEKs (MEK), 200 parts by weight of toluene and 100 weight portion cyclopentanone, obtain the dispersion of extinction particle.(Aekyung Chemical Korea) mixes with this dispersion, stirs 7 hours then to obtain the resin solution of particle dispersion with 50 weight portions (solids content) thermosetting acrylic resin.At the moulding light-absorption layer preceding 1 hour, (Aekyung Chemical was Korea) with the coating fluid of preparation light-absorption layer to add the isocyanate curing agent of 25 weight portions in this resin solution.This coating fluid is coated on the optical diffusion layer the dry thick light-absorption layer of 7 μ m that forms with the scraper rubbing method.Zhi Bei multi-layer optical film is shown in Fig. 4 like this.Physical property according to abovementioned steps assessment blooming.
Embodiment 2
Prepare multi-layer optical film with the method identical, except the consumption of extinction particle is that 150 weight portions are to form light-absorption layer on optical diffusion layer with embodiment 1.
Embodiment 3
As follows with the incompatible manufacturing of the optical films OLED display of embodiment 1 or 2 preparations: the bonding coat on opposite that is positioned at the blooming light-absorption layer is attached to 14.1 inches OLED displays (Samsung Electronics, Korea) top of transparent substrates (indium oxide titanium (ITO) glass).Measure white brightness at 500lx.
Comparative Examples 1
For the optical property with the OLED display that uses typical circular polaroid (being made of linear polarizing plate and 1/4th (1/4) wavelength plates) compares the optical property of assessment polaroid, the brightness of measuring the OLED display that uses this polaroid.
Comparative Examples 2
Make the OLED display, wherein on the top of OLED light-emitting component clear glass substrate, do not adhere to blooming.Externally light (500lx) is measured the contrast of OLED display down.
Comparative Examples 3
By arranging that on the clear glass substrate top of light-emitting component the single layer optical film that only contains light-absorption layer prepares the OLED display.Externally light (500lx) is measured the contrast of OLED display down.
The optical property of blooming and OLED display is shown in following table 1 and 2.
Table 1: brightness ratio
Optical diffusion layer Light-absorption layer Penetrability (PET → coating layer) Penetrability (coating layer → PET) Unidirectional penetrability Brightness (the extraneous light: 500lX) of white light
Transparent resin (weight portion) Particle (weight portion) Transparent resin (weight portion) Particle (weight portion)
Embodiment 1 100 200 100 200 65% 40% 25% 393cd/m 2
Embodiment 2 100 200 100 150 60% 40% 20% 390cd/m 2
Comparative Examples 1 Polaroid 45% 45% 0% 179cd/m 2
Comparative Examples 3 Extinction monofilm (no optical diffusion layer) 64% 45% 19% 384cd/m 2
Table 2: the comparison of contrast (CR)
Optical diffusion layer Light-absorption layer Contrast (white/black) (extraneous light: 500lx)
Transparent resin (weight portion) Particle (weight portion) Transparent resin (weight portion) Particle (weight portion)
Embodiment 1 100 200 100 200 7.1
Embodiment 2 100 200 100 150 6.6
Comparative Examples 3 Extinction monofilm (no optical diffusion layer type) 6.3
Comparative Examples 2 Substrate of glass 4.0
From the data of table 1 and 2 as can be seen, compare, use the OLED display of the embodiment of the invention 1 and 2 bloomings of making to demonstrate brightness respectively and improved with the OLED display of the typical circular polaroid that uses Comparative Examples 1 to make.And, to compare with the 3 OLED displays made from Comparative Examples 2, the OLED display of the use embodiment of the invention 1 and 2 bloomings of making demonstrates contrast and has improved.
From as can be seen above, compare with the display that uses common polaroid, use the OLED display of blooming of the present invention to have excellent luminance, this blooming is coated with the manufacturing of extinction particle on transparent substrates.And from the reflectance pattern of Fig. 6 as can be seen,, can improve the image visibility and the sharpness of the OLED display that uses this blooming because the average surface reflectance of blooming of the present invention is 5% or lower.
And, compare with the OLED display that only comprises the single layer optical film manufacturing of light-absorption layer in light-emitting component clear glass substrate top layout with the OLED display of not arranging blooming at OLED light-emitting component clear glass substrate top, the OLED display of use blooming of the present invention demonstrates contrast performance and has improved.
Though the present invention discloses preferred specific embodiment for illustrative purposes, those skilled in the art can know under the situation of scope that does not deviate from claims of the present invention and aim, can carry out multiple improvement, combination and alternative.

Claims (17)

1. an antiradar reflectivity brightness that is used for display strengthens multi-layer optical film, comprise transparent substrates, be formed on the lip-deep optical diffusion layer of transparent substrates and be formed on light-absorption layer on the optical diffusion layer, wherein optical diffusion layer comprises resin and spherical particle, light-absorption layer comprises the extinction particle of transparent resin and core-shell structure, and this extinction particle is by constituting as the optical absorbing agent of core material with as the transparent resin of case material.
2. according to the multi-layer optical film of claim 1, wherein owing to have optical diffusion layer or light-absorption layer, blooming demonstrates unidirectional characteristic, and (unidirectional characteristic is the characteristic relevant with unidirectional penetrability, and unidirectional penetrability is defined as penetrability poor of following propagation path of light: (i) light source → blooming (transparent substrates/light diffusion particles coating layer/extinction particle coating layer) → whole spheroid; (ii) light source → blooming (extinction particle coating layer/light diffusion particles coating layer/transparent substrates) → whole spheroid).
3. according to the multi-layer optical film of claim 1, wherein the thickness of transparent substrates is 10-300 μ m.
4. according to the multi-layer optical film of claim 1, wherein be formed on the lip-deep optical diffusion layer of transparent substrates and comprise resin and spherical particle.
5. according to the multi-layer optical film of claim 1, wherein light-absorption layer comprises the clear binder resin of 100 weight portions and the core-shell structure extinction particle of 50-500 weight portion, and this extinction particle is by constituting as the optical absorbing agent of core material with as the transparent resin of case material.
6. according to the multi-layer optical film of claim 1, wherein optical diffusion layer and light-absorption layer are coated with method by wetting and form multilayer.
7. according to the multi-layer optical film of claim 1, wherein light diffusion particles satisfies following condition:
The diameter of light diffusion particles is 1-50 μ m; With
Light diffusion particles is the spherical transparent particle, is selected from following composition: silicon dioxide, acryl resin, polystyrene resin, styrene-propene acid copolymer resin, polyvinyl resin, epoxy resin, organic siliconresin, silicon rubber, and their potpourri.
8. according to the multi-layer optical film of claim 1, wherein the extinction particle satisfies following condition:
A core is arranged in an extinction particle;
The diameter of extinction particle is 1-50 μ m;
Core is positioned at the inside of extinction particle, makes the degree of eccentricity of core be lower than 0.5 (radius of the distance/extinction particle of degree of eccentricity=from extinction particle center to the core center); With
Core is 0.2-0.75 with the mean diameter ratio of extinction particle.
9. according to the multi-layer optical film of claim 1, wherein be formed in the light-absorption layer on the optical diffusion layer 50% extinction particle and be arranged to single layer structure.
10. according to the multi-layer optical film of claim 1, wherein optical absorbing agent is selected from following composition: carbon black, black pigment, black dyes, iron oxide, and their potpourri.
11. according to the multi-layer optical film of claim 1, wherein the extinction particle is made up of optical absorbing agent and resin, optical absorbing agent is selected from following composition: carbon black, black pigment, black dyes, iron oxide, and their potpourri.
12. according to the multi-layer optical film of claim 1, the material that wherein constitutes housing is selected from following composition: acryl resin, styrene resin, pet resin, acrylic acid-styrene copolymer resin, and their potpourri.
13. according to the multi-layer optical film of claim 1, wherein transparent substrates is film or the sheet material by following made: polyethylene terephthalate, PEN, polycarbonate, polymethylmethacrylate, polystyrene, and their potpourri; Transparent resin is selected from following composition: acryl resin, methacrylic resin, urethane resin, styrene resin, epoxy resin, vibrin, and their potpourri.
14. according to the multi-layer optical film of claim 1, wherein the average surface reflectance of light-absorption layer is 6% or still less.
15., wherein wetly be coated with method and be selected from following method according to the multi-layer optical film of claim 6: the intaglio plate coating, mouthful pattern coating, the scraper coating, kapillary coating and scraper are coated with.
16. according to each multi-layer optical film among the claim 1-13, with the surface of the surperficial relative transparent substrates that is formed with light-absorption layer on also be formed with bonding coat.
17. 0LED display, wherein be arranged in the top of light-emitting component transparent substrates according to each blooming among the claim 1-14, light-emitting component comprises from the bottom laminated negative electrode, luminescent layer, anode and the transparent substrates of preface according to this, thereby makes the light-absorption layer of blooming be positioned at the opposite of light-emitting component.
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